LMV227 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Production RF Tested, RF Power Detector for CDMA and WCDMA

July 2006
LMV227
Production RF Tested, RF Power Detector for CDMA and
WCDMA
General Description
The LMV227 is a 30 dB RF power detector intended for use
in CDMA and WCDMA applications. The device has an RF
frequency range from 450 MHz to 2 GHz. It provides an
accurate temperature and supply compensated output volt-
age that relates linearly to the RF input power in dBm. The
circuit operates with a single supply from 2.7V to 5V. The
LMV227 has an integrated filter for low-ripple average power
detection of CDMA signals with 30 dB dynamic range. Addi-
tional filtering can be applied using a single external capaci-
tor.
The LMV227 has an RF power detection range from -30
dBm to 0 dBm and is ideally suited for direct use in combi-
nation with resistive taps. The device is active for Enable =
HI, otherwise it goes into a low power consumption shut-
down mode. During shutdown the output will be LOW. The
output voltage ranges from 0.2V to 2V and can be scaled
down to meet ADC input range requirements. The output
signal bandwidth can optionally be lowered externally as
well.
Features
n 30 dB linear in dB power detection range
n Output voltage range 0.2 to 2V
n Logic low shutdown
n Multi-band operation from 450 MHz to 2000 MHz
n Accurate temperature compensation
Applications
n CDMA RF power control
n WCDMA RF power control
n CDMA2000 RF power control
n PA modules
Typical Application
© 2006 National Semiconductor Corporation DS201181
20118101
www.national.com